DOI: 10.1111/gcb.12188
论文题名: Canopy-scale relationships between stomatal conductance and photosynthesis in irrigated rice
作者: Ono K. ; Maruyama A. ; Kuwagata T. ; Mano M. ; Takimoto T. ; Hayashi K. ; Hasegawa T. ; Miyata A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 7 起始页码: 2209
结束页码: 2220
语种: 英语
英文关键词: Agroecosystems
; Canopy micrometeorology
; CO2 flux
; Crop physiology
; Eddy covariance
; Evapotranspiration
; Leaf nitrogen
; Net ecosystem exchange
; Surface energy balance
; Water-use efficiency
Scopus关键词: agricultural ecosystem
; canopy
; carbon dioxide
; carbon flux
; eddy covariance
; energy balance
; evapotranspiration
; leaf
; micrometeorology
; net ecosystem exchange
; nitrogen
; photosynthesis
; physiology
; rice
; stomatal conductance
; water use efficiency
; article
; biological model
; China
; growth, development and aging
; irrigation (agriculture)
; photosynthesis
; physiology
; plant stoma
; rice
; season
; time
; weather
; Agricultural Irrigation
; China
; Models, Biological
; Oryza sativa
; Photosynthesis
; Plant Stomata
; Seasons
; Time Factors
; Weather
英文摘要: Modeling stomatal behavior is critical in research on land-atmosphere interactions and climate change. The most common model uses an existing relationship between photosynthesis and stomatal conductance. However, its parameters have been determined using infrequent and leaf-scale gas-exchange measurements and may not be representative of the whole canopy in time and space. In this study, we used a top-down approach based on a double-source canopy model and eddy flux measurements throughout the growing season. Using this approach, we quantified the canopy-scale relationship between gross photosynthesis and stomatal conductance for 3 years and their relationships with leaf nitrogen content throughout each growing season above a paddy rice canopy in Japan. The canopy-averaged stomatal conductance (gsc) increased with increasing gross photosynthesis per unit green leaf area (Ag), as was the case with leaf-scale measurements, and 41-90% of its variation was explained by variations in Ag adjusted to account for the leaf-to-air vapor-pressure deficit and CO2 concentration using the Leuning model. The slope (m) in this model (gsc versus the adjusted Ag) was almost constant within a 15-day period, but changed seasonally. The m values determined using an ensemble dataset for two mid-growing-season 15-day periods were 30.8 (SE = 0.5), 29.9 (SE = 0.7), and 29.9 (SE = 0.6) in 2004, 2005, and 2006, respectively; the overall mid-season value was 30.3 and did not greatly differ among the 3 years. However, m appeared to be higher during the early and late growing seasons. The ontogenic changes in leaf nitrogen content strongly affected Ag and thus gsc. In addition, we have discussed the agronomic impacts of the interactions between leaf nitrogen content and gsc. Despite limitations in the observations and modeling, our canopy-scale results emphasize the importance of continuous, season-long estimates of stomatal model parameters for crops using top-down approaches. © 2013 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62392
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: National Institute for Agro-Environmental Sciences, Tsukuba, Ibaraki, 305-8604, Japan; National Agriculture and Food Research Organization, Kumamoto, 861-1192, Japan; Graduate School of Horticulture, Chiba University, Matsudo, Chiba, 271-8510, Japan
Recommended Citation:
Ono K.,Maruyama A.,Kuwagata T.,et al. Canopy-scale relationships between stomatal conductance and photosynthesis in irrigated rice[J]. Global Change Biology,2013-01-01,19(7)